For a study, researchers sought to conduct a retrospective study using data from a prospectively kept database at a single center between January 2019 and September 2021. Using the fissure development score system, patients were separated into 2 groups based on their level of pulmonary fissure completion (PFC). Group A consisted of patients with PFC grades of 2 or 3, who were classified as having incomplete pulmonary fissures, while Group B consisted of patients with PFC grades of 0 or 1, who were classified as having complete pulmonary fissures. Clinic results and differences in demographics and perioperative factors were compared. The data were analyzed using a multivariate logistic regression model. A total of 213 patients had video-assisted thoracoscopic lobectomy for congenital lung malformation (CLM). About 30 patients were allotted to Group A, whereas 183 were spread over Group B. According to their findings, the rate of complications was higher in Group A than in Group B, notably for Clavien-Dindo stages II and III. Chest tube drainage time and total hospital stay after surgery increased considerably with PFC severity. The degree of PFC was a significant predictor of postoperative problems in multivariate logistic regression analyses. In children with CLM, the risk of complications after thoracoscopic lobectomy is related to the severity of PFC.